Electric heating fabric.



No. 869,460. PATENTED OCT. 29, 1907. W. RICHMOND.

ELECTRIC HEATING FABRIC.

APPLICATION FILED JUNE 16, 1905i 2 SHEETS-SHEET l.

No. 869,460. PATENTED OCT. 29. 19C?. w. RICHMOND. ELECTRIC EEATINC EAEEIC.

APYLIOATION FILED JUNE 16l 1905.

2 SHEETS-SHEET 2.

WALTER RICHMOND, MEMPHIS, TENNESSEE.

' ELECTRIC HEATING F ABBIC.

To all whom it may concern:

Be it known that I, WALTER RrcnMoNn, a citizen of the United States, residing at Memphis, in the county of Shelby, State of Tennessee, have invented certain new and useful Improvements in Electric Heating Fabric', and l do hereby declare the following to be a full, clear, andk exact description oi the invention, such as will enable others skilled in the art to which it appertains to make and use the same.4

'This invention relates to electric heating fabrics or pads and regulators for controlling heat and maintaining a practically constant temperature.

The object ot' the invention is to provide a pad which will be electrically heated for use under the various conditions to which it is adapted and which will have a large heating capacity while it will occupy a small space.

A further object o the invention is to provide in connection with the pad, means or regulating the consumption of current in the pad so that the quantity oi heat given off will be automatically adjusted. Thus, when the pad is subjected to air currents or is exposed so that the heat may pass quickly from it, the current flows steadily and maintains the temperature, and when the pad is covered so that the heat passes from it very slowly and the temperature is thereby raised, the

governor acts so as to open the circuit and keep an even temperature of the pad.

Other objects and advantages of the invention will be understood from the following description.

In the drawings forming a portion of this specification and in which like numerals of reference indicate similar parts in the several views, Figure l is a,k plan view oi a mat or pad embodying the present invention. Fig. 2 is a top plan view similar to Fig. l with the top portion of the covering removed. Fig. 3 is a view taken diametrically through the mat or pad. Fig. 4 is a detail view oi a portion of the asbestos core with the conducting wire wound around. Fig. 5 is a top plan view of a different form of governor regulator or controller. l

Referring now to the drawings, the pad or mat is formed around a central member comprising a base A, of insulating material, upon which is pivoted an eccentric. K, operated by an indicating lever B, for regulating the degree of heat, said lever can be moved over the graduated scale c, and can be set to indicate the re quired degree of heat.

Fixed at one end to a plate E, mounted on the base A, is a convolute spring F, on the opposite end o which is a Contact point J, at which point the circuit is made variations of temperature. A` high resistance conducting wire G, is wound upon, and insulated from the spring F, except at the' contact point, where it is electrically connected to the spring F', the opposite end of Specification of Letters Patent.

and broken, as the spring is coiled or uncoiled by the Patented 29, 1907.

Application iled 51111018. 1905'. Serial No. 265.584.

the wire G, is connected to a binding post I, on the base A; the lever B, with the eccentric K, is electrically connectedj through its Vpivot forming the other binding post. Thus it will be seen, that a current, of electricity passing from the post I, to the eccentric K, will heat the lwire G, softhat. it wi-ll in turn heat. the spring F, and the latter `will uncoil and open the circuit at the contact point J, stop the generation of heat and cause a falling temperature which will cause the spring F, to coil again, thus renewing the contact at J, and this makingand` breaking of circiiit will .occur as often as the temperature rises to the required degree indicated on the scale C by the lever B. The lever B can be shifted to show any desired degree o heat on the scale C, and to operate the eccentric K, and increase or diminish the pressure on the spring F, thus requiring a greater or less degree of heat to cause it to uncoil and break the circuit.

About the regulator above described, is formed the mat or pad which consists of asbestos rolled in cylindrical form to make a core 5, Fig. 4, about which is wound a wire 6 of Germansilver or other metal of high resistance, the wire being provided with an insulating covering 7. The unit thus formed is wound around the base oi the regulator into spiral orm as illustrated in Fig. 2, the convolutions of the spiral being separated by a strip oi asbestos 8 which serves to insulate the wire thoroughly and prevent chaing oi the contiguous convolutions. i

A cloth covering m, Fig. 3, is provided and serves only to make a protection or nish for the anat or pad, from which it is separate and distinct. i The convolutions of thc unit are held in close relation by radial lines of stitching 9, Figs. I and/3, the stitches passing between the convolutions oi the conductor. Woven lines, the threads passing alternately over and under the contiguous convolutions, may be substituted or the radial lines of stitching it desired.

One end of the conducting line is attached to the binding post I, or directly to the wire G, so that the wire G and G will be in series. In use wires from a suitable source of electricity are connected respectively to the pivot of eccentric K, and the outer end of the Wire 6, the regulator controller or governor as above described serving to regulate the temperature by making and breaking the circuit; In Fig. 5 ofthe drawings there is shown a structure embodying a different ormo controller regulator or governor embodying the same principle as shown above, including a base 3() of insulating material having a straight bar 3l mounted thereon the cb-eicient o expansion of which is very high. This bar has a Contact point 33 which-presses on the eccentric 37, which eccentric is operated by the indicating lever 34. The pressure on the eccentric 37 at the contact point 33 is regulated by shifting the lever 34 over l the graduated scale of degrees 35, a conducting wire 36 vcontroller :in-i with the conductor the sume, the said controller being arranged when expandl niins l r lexe t i wound ou a lated from the ba c pta the ed to break its contactwith the member.

contact point 33 where. it iselectri'cailyrconnected to' the bar. A current of electricity'passing through' the wire 36 heats the bar 31, the bar on application of heat will draw away from the 'eccentric 37 and break the circuit; the resulting failing of temperature causes the bar to straighten, and assume its original position, thus closing the circnitagain. This operation is repeated as often as the temperature rises to the original degree of heat, as shown by the indicating lever on the scale 35. It will be understood that in practice, other-ineditieationsof the speeitic construct ion shown may be made, and any suitable materials and proportions may be used for the various parts without departing from the spirit a high resistance clement wound-about the core, a resilient controller mounted upon ih e core, u high reslstnnce conductor wound around the controller und in lcircuit there willi nl. its free end, snld rcslsinnco conductor being in circuit with the reslstnnre conductor wound about the core, nud n movable contact arranged upon the cone, said contnct beinginovahle -to .-idjiist the tcusionol.' the expnnsible controller, said controller being-arranged to break its contact with tile contact member when expanded.

3. A fabric for mais or pads consisting oi' a high resistance conductor wound about n core und bent splraily nhout n cenirni member, and having its convolntions insulated from each other und u controller, regulator, or governor mounted ou tiret-entrai member and said controller oijthc i nvcution. y

What I claim is:- l

1. The combination-with an electr-ic heating mnt or the likt` composed oi n high resistance conductor wound nhont acore, of :In expunslble controller mounted upon the coro. n high resistance conductor in circuit with ihc cxlninsirlt which is wonnd nhoui. the core. nud moans arranged upon the core und in cil-vuil `with ihc cxpnnsible controller-,for adjusting the tension oi' any desired temperature in the heating.: fabric.

in testimony wlu'rreol; I ailix my signature, in presence oi' two witnesses.

I y WAT/PMR RICHMOND.

Witnesses (Jn/umn JouNs'roN, CHARLES JUHNSTON.

2. An electric yheating mat or the like. comprising a core.,

in circuit with snld conductor, nutonn|tlc.|lly maintaining' 

